Bench-drill.



G. O. LEOPOLD.

BENCH DRILL.

APPLICATION FILED DBO. 10, 1912.

Patented Feb. 17, 1914.

2 SHEETS-SHEET l.

COLUMB A PLANOGRAPH c0.,WASH|NOTON. n c.

G. 0. LEOPOLD.

BENCH DRILL.

, APPLICATION FILED 1330.10, 1912.

Patented Feb. 17, 1914.

' 2 SHEETS-SHEET 2 r I 1 l 1 @TAS ATNT FTQE.

GEORGE O. LEOPOLD, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO NORTH BROE)MFG 00., OF PHILADELPHIA, PENNSYLVANIA, A GGRPORATION 0F PENNSYL- VANIA.

BENCH-DRILL.

To all 107mm it may concern:

Be it known that l, GEORGE O. LnoroLn, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Bench-Drills, of which the following is a specification.

My invention relates to certain improvements in bench drills and is ofthe type which is detachably secured to a bench and operated by hand,although it will be understood that the invention can be operated bypower it desirable.

The object of my invention is to simplify the construction of a drill ofthis character, as well as to cheapen its cost of manufacture. I make itautomatic in its action and provide means for changing the speed of thedrill or for locking the spindle to allow the chuck to be opened orclosed.

In the accompanying drawings :--Figure 1, is a front elevationillustrating my improved bench drill; Fig. 2, is a side view; Fig. 3, isa sectional plan view on the line a a, Fig. 2; Fig. 4;, is an enlargedvertical sectional view through the upper portion of the drill on theline Z)Z'), Fig. 1; Fig. 5, is a sectional plan view on the line 00,Fig. 4t; Fig. 6, is a sectional plan view on the line (Z(Z, Fig. 4; Fig.7, is a sectional view on the line ee, Fig. 1; and Fig. 8, is a detachedperspective View illustrating the change speed mechanism.

Referring to the drawings, 1 is the post of the drill, cylindrical incross section, as illustrated in Fig. 3, and having an integral clampplate 2 projecting at the rear thereof and a bracket 3 in which ismounted a clamp screw 1- for securing the drill to a bench or othersupport.

5, 5 are two screws, pointed at one end, and mounted in the clamp plate.After the clamp is secured in position by the clamp screw 4, thesepointed screws can be turned so as to be driven into the bench to firmlyhold the tool from turning on the screw 4 as a pivot.

On the face of the post 1 is a slotted guide 6 adapted to receive atongue of a sliding bracket 7 having a socket 8 for the stem 9 of thebase plate 10 on which the work is mounted.

11 is a clamp screw having a T-head adapted to the slot 6 in the post,which is illustrated in Fig. 3, and provided with a nut which bearsagainst the bracket 7 so Specification of Letters Patent.

Application filed. December 10, 1912.

Patented Feb. 1 7, 1214-. Serial No. 735,872.

that the bracket is held in the position to which it is adjusted by thisnut.

The upper end of the post 1 has two bear ngs 12 and 13 connected by ayoke 14, having a bearing'lo for the main horizontal shaft 16, which isprovided with a handle 17 1n the present instance. At the inner end ofthi shaft is a bevel gear wheel 18 having a ser es of teeth 19 in itsperiphery and a series of teeth 20 near its hub, as shown by dottedlines in Fig. 2. Mounted in the bearlng 12 1s a spindle 21 having at itslower end a chuck 22, of any ordinary type, to which the drill issecured. This spindle 21, as illustrated in Fig. 41:, passes through asleeve 12 and two bevel gear wheels 23and 2 1. The spindle is slottedlongitudinally to receive a key 43 projecting from the sleeve 42 so thatthe spindle will turn with the sleeve. The teeth of the wheel 23 meshwith the outer teeth 19 of the wheel 18 and the teeth of the wheel 24mesh with the inner teeth 20 of the wheel 18. Both of these wheels 23and 24 are loose on the spindle and are clamped thereto by mechanismshown in Fig. 8, and which will be described hereinafter.

On the upper end of the spindle is a feed screw 25, which is heldlongitudinally thereon by a collar 3]. at the lower end and by a cap atthe upper end. The spindle is free to turn in the feed screw but mustmove longitudinally with it. The feed screw 25 is adapted to a threadedopening in the bearing 13 and has at its upper end a ratchet wheel 26locked to the threaded feed screw 25 by means of a ball 27 mounted in asocket in the spindle 21 and in the socket back of the ball is a spring28. The ball is adapted to a notch 29 in the feed screw, as shown inFig. 6, so that, under normal conditions, the spindle turns with thefeed screw, but if the drill should bind in the material, then thespindle would be uncoupled from the feed screw, as the pressure causesthe ball to overcome the pressure of the spring, as a result of whichthe ball enters the socket and allows the feed screw to turn freelywithout turning the spindle.

The spindle 21 is grooved at 30 to receive the collar 31 and carried bythis collar is a ball bearing 32 on which the end of the feed screwpresses so that when the drill is engaged in the work, the pressure 01the feed screw 25 is taken by the ball bearing 32.

33 is a guide rod attached to the bearing 13 and secured to the lowerend of this rod is head 31, lJ-shaped to extend on each side of thespindle and above the gear wheel 2-l. The upper end of the rod passesthrough a block 35 on the upper end of the spindle 21, and between theupper end of the feed screw 25 and this block is a pawl carrier 36pivoted to a post 37 on the block 35 and carrying a spring pawl 88adapted to engage the ratchet teeth at the upper end of he feed screw25. This pawl is spring-pressed and has an arm 39 by which it can beturned. he carrier 36 notched at lO to allow the handle 39 to drop intoplace so as to lock it when adjusted to feed either to the right or tothe left, but when the handle is in the mid-position the pawl itself iswithdrawn, as illustrated. The carrier is rocked on its pivot 3'? by acam projection on the spindle 21, which is made by notching the spindle,as illustrated in Fig. 5, and placing therein a roller l-l. The openingin the carrier is of such a size and shape that, as the spindle turns,the roller will rock the carrier on its pivot 87. Vi hen however thepawl 1S not engaged with the ratchet teeth 36, it will turn the feedscrew a certain distance at each revolution of the spindle.

T is gear wheels 28 and are clamped to the spindle 21 by the mechanism Iwill now proceed to describe.

The sleeve 42 has a longitudinal slot and two transverse slots, Fig. 8,adapted to receive the double fingered pawls 4:41. The pivot projectionsto of these pawls rest in the transverse slots.

a6 is the shifter having a pin l? which projects through a cover plate48 and through the inclosing casing 49. The shifter L6 is in the form ofa spring and when shifted into the central position, the fingers of bothpawls are in engagement with the ratchet teeth 50 and 51 on the hubs ofthe two gear wheels 2 respectively, but when it is moved into the lowerposition the lower pawl is in engagement with the ratchet wheel and theupper pawl is moved out of engagement with its ratchet wheel 51. Thespindle is then driven at high speed through the medium of the teeth 19on the gear wheel 18 and the pinion 23; When the shifter is moved to theupper position, then the upper pawl engages the teeth of the ratchetvheel 51 and the lower pawl is clear of the ratchet wheel 50; thespindle being driven at a slow speed through the teeth 20 on the wheels18 and 24.

It will be seen from the above description that I am enabled to make anexceedingly simple and practical bench drill in which the change gearingand ratchet feed mechanism are mounted on the spindle. The change speedgear is such that the spindle can either be driven at a slow speed or ata high speed, or when the shifter is moved to the central position thespindle is locked so that the chuck can be opened or closed withoutturning the spindle. Furthermore the ratchet or feed mechanism ismounted so as to move bodily with the spindle and is actuated on therotation of the spindle. The frame is simplified by having the lowerhead, which retains the gearing on to the bearing 12 secured to theguide rod which is also used as a guide for the ratchet feed mechanism.

The change speed mechanism illustrated and described forms the subjectof a separate application for patent tiled on the 20th day of September1912 under Serial No. 790,901.

I claim:

1. The combination in a drill, of a post; hearings on the post; atransverse lriving shaft mounted in one of the bearings; a spindlemounted in the other bearing; a sleeve to which the spindle is splined;gearing between the sleeve and the driving shaft; a guide rod secured tothe upper bearing and having a head at its lower end embracing thesiindle; a block slid-ably mounted on the upper portion of the rod andsecured to the spindle; a bearing collar on the spindle above the head;a feed screw through which the spindle extends resting on the collar andadapted to a threaded opening in one of the bearings of the post; ayielding connection between the feed screw and the spindle; areciprocating carrieradapted to the head and located between the upperend of the feed screw ant the head; a pawl on the carrier; and ratchetteeth on the upper end of the feed screw with which the pawl engages.

2. The combination in a bench drill of a post; means for securing thepost to a bench; a table; bearings on the post; a transverse drivingshaft mounted in one of the bearings; a spindle mounted in the otherbearings; a sleeve to which the spindle is splined; gearing between thesleeve and the driving shaft; a guide rod secured to the upper bearingand having a head at its lower end encircling the spindle; a blockslidable on the upper portion of the rod and secured to the spindle; abearing collar on the spindle above the head; a feed screw through whichthe spindle extends, rest ing on the col or and adapted to a threadedopening in one of the bearings of the post; a reciprocating carrieradapted to the head and located between the upper end of the feed screwand the head; a pawl on the carrier; ratchet teeth on the upper end ofthe feed screw with which the oawl. engages; a stop at the upper end ofthe guide rod for limiting the upward movement of the spindle; and meansfor yield ingly connecting the spindle to the feed screw.

The combination in a drill, of a post having upper and lower bearings; aspindle; a feed screw through which the spindle extends; a bearingcollar on the spindle for the end oi the feed screw; two bevel gears;clutch mechanism whereby the gears are connected to the spindle; a guiderod se cured to the upper bearing of the post and having a head at itslower end embracing the spindle and confining the gears between it andthe lower bearing: ratchet mechanism on the guide rod for turning thefeed screw; and means on the spindle for actuating the ratchetmechanism.

4-. The combination in a drill, of a bearing; a feed screw adapted to athreaded opening in the bearing; a spindle extending through the feedscrew, said spindle having a bearing collar against which the lower endof the feed screw rests; a guide rod at one side of the spindle andextending parallel therewith; a block on the spindle embracing the guiderod; acarrier adapted to the block at one side of the spindle, thespindle extending through the carrier; a pawl on the carrier; a ratchetwheel on the end of the feed screw with which the pawl engages, thespindle having a recess at the carrier; a roller in the recess adaptedto travel in the opening in the carrier to cause the carrier toreciprocate as the spindle rotates; and a yielding connection betweenthe spindle and the feed screw.

5. The combination in a drill, 01 a frame;

a vertical spindle mounted in the frame; means for driving said spindle;ratchet feed mechanism consisting of a feed screw through which thespindle extends and having a ratchet wheel at its upper end; a carrier ablock to which the carrier is pivoted; said block being mounted on theupper end of the spindle; a projection on the spindle for actuating thecarrier; and a pawl on the carrier arranged to engage the ratchet teethon the feed screw.

(5. The combination in a drill, of a spindle; means for rotating thespindle; a feed screw mounted on the spindle and having ratchet teeth; ablock mounted on the upper end. of the spindle; a guide for the block; acarrier mounted between the block and the feed screw and pivoted to theblock and having an opening for the passage of the feed screw; a pawl onthe carrier engaging the ratchet teeth of the feed screw; a threadedbearing through which the feed screw eX- tends; a projection on thespindle arranged to engage and to reciprocate the carrier; and frictionmechanism carried by the spindle and directly engaging the feed screw.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

GEORGE O. LEOPOLD.

lli tnesses TH. E. SHUPE, 71!. A. BARR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patentn, Washington, D. G."

